Canon NB-12L Replacement Battery 3.6V 1900mAh Li-ion

Canon PowerShot N100 / G1X Mark II — 3.6V Li-ion Replacement Battery (NB-12L)

This is a 3.6V, 1900mAh (6.84Wh) Li-ion cell built to the NB-12L specification. It fits the Canon PowerShot N100, PowerShot G1X Mark II, LEGRIA Mini X, and VIXIA Mini X. All four bodies share the same battery bay dimensions and BMS handshake protocol.

• PowerShot N100 and G1X Mark II platform: Canon grouped these bodies on a shared power architecture — same 3.6V rail, same connector pinout, and the same fuel-gauge communication line. One cell works across all four models without any modification.
• Bench tested on actual hardware: We cycled this cell through the PowerShot N100 body. The BMS accepted the cell, fuel-gauge data transmitted correctly on the communication pin, and the camera reported charge state accurately across the full discharge curve.
• First-install charge cycle on the NB-12L platform: Run the first full charge inside the camera body using the USB-C port or the Canon charger — not a generic multi-bay charger. Canon's BMS maps the fuel gauge against cell voltage during that initial cycle. Skipping this step causes the battery percentage display to read inaccurately from the first shoot.

Flash capacitor recharge drag at low cell voltage on the G1X Mark II

The G1X Mark II routes significant current to the flash capacitor between exposures. As cell voltage drops toward 3.2V near end of charge, that recharge draw causes a measurable voltage sag on the output rail. The camera's processor detects the sag and may flag a low-battery warning even when the cell still holds usable capacity. This is normal BMS behaviour — not a faulty cell. Shooting without flash removes the recharge load and extends usable capacity into that lower voltage window.

Battery percentage jumping erratically on the PowerShot N100 display

This happens when the camera's fuel-gauge algorithm hasn't yet mapped its discharge thresholds to the replacement cell's actual voltage curve. The indicator jumps — often from 80% to 40% without warning — because the camera is interpolating against a reference curve calibrated to the original cell. One complete discharge-to-cutoff cycle followed by a full charge inside the camera body recalibrates the mapping. After that cycle, the percentage readout stabilises. Discharge to the camera's auto-off point — around 3.0V cutoff — then charge fully before shooting again.